Fixed some more IOS issues

ios/Classes/FluttertoastPlugin.m

@@ -5,7 +5,7 @@
 static NSString *const CHANNEL_NAME = @"PonnamKarthik/fluttertoast";
 
 @interface FluttertoastPlugin ()
-@property(nonatomic, retain) FluttertoastPlugin *channel;
+@property(nonatomic, retain) FlutterMethodChannel *channel;
 @end
 
 @implementation FluttertoastPlugin {

ios/Classes/UIView+Toast.h

@@ -89,8 +89,6 @@ extern const NSString * CSToastPositionBottom;
  @param duration The toast duration
  @param position The toast's center point. Can be one of the predefined CSToastPosition
                  constants or a `CGPoint` wrapped in an `NSValue` object.
- @param title The title
- @param image The image
  @param style The style. The shared style will be used when nil
  @param completion The completion block, executed after the toast view disappears.
                    didTap will be `YES` if the toast view was dismissed from a tap.